[Elecraft] KPA500 in RTTY Contesting

[Ken K6MR]

I monitor mine with the remote program which shows temp on screen. When the fans go to high speed the temp drops very quickly. The thermal design appears to have plenty of reserve capability. I think the temp cut off is 90C. I’ve never seen mine go above 73C.

Ken K6MR

From: Bob McGraw K4TAX<mailto:rmcgraw at blomand.net>
Sent: Wednesday, January 27, 2016 16:48
To: elecraft at mailman.qth.net<mailto:elecraft at mailman.qth.net>
Subject: Re: [Elecraft] KPA500 in RTTY Contesting

The most destructive element to all solid state devices is......... HEAT!

The KPA500 seems well protected and will drop off line if the
temperature exceeds a preset level.   My only concern regarding pushing
an amp like this or any other solid state amp to near rated values, same
for near maximum heat values, what happens if the protection circuit
fails?   Hopefully the software will recognize a protective circuit
failure and shut the amp down.

73
Bob, K4TAX

On 1/27/2016 4:14 PM, Irwin Darack wrote:
> I am curious to others experience with the KPA500 in a RTTY  Contest. What
>   is the power level that others have used, fan levels and long term affect
> on the power transistors?
>
> I ask, as so far I have run the amp at no more than 300 watts with the fans
> at there highest level. I do not want to harm the power transistors.
>
> Thanks, Irwin KD3TB
>
>


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